Certificate-based encryption and public key infrastructure
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[0017] The present invention provides methods for implementing a secure and practical certificate-based encryption scheme.
[0018] According to one aspect of the present invention, the method provides for encoding and decoding a digital message between a sender and a recipient in a public-key encryption scheme including the sender, the recipient and an authorizer. The method includes the steps of generating a recipient public key / recipient private key pair and a recipient encryption key. A key generation secret that is a secret of the authorizer is selected. A recipient decryption key is generated using at least the key generation secret and the recipient encryption key where a key formed from the recipient decryption key and a key formed from the recipient encryption key are a public key / private key pair.
[0019] The digital message is encrypted using at least the recipient public key and the recipient encryption key to create an encrypted digital message. The encrypted digital messa...
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